Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
MessageOne - MessageOne offers email management solutions such as EMS and AlertFind for archiving, e-discovery, security and notification services.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Vade Secure - Email security to protect against email-borne phishing, spear phishing, malware, and ransomware. Email security and management based on artificial intelligence.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.